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sarkararghya
Joined: 18 May 2006
Posts: 102
Helped: 3
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 20 Aug 2008 7:02 Phase response of of second degree differentiator |
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I design a specific second order digital differentiator for a specific application where phase difference must be equal to pi over a specified frequency range. I use the following MATLAB prog. to determine the phase difference. Am I correct ?
[H,W]=freqz(B1,A1),
plot(W/pi,phase(H))
Specifically my question is, is phase response and phase difference are identical ?
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FvM
Joined: 22 Jan 2008
Posts: 2635
Helped: 431
Location: Bochum, Germany
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| 20 Aug 2008 14:51 Phase response of of second degree differentiator |
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| An inverting amplifier also produces a "pi" (180°) phase difference...
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bhq
Joined: 11 Jun 2008
Posts: 81
Helped: 7
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| 29 Aug 2008 11:07 Re: Phase response of of second degree differentiator |
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You are doing right. But if your phase difference is not equal to pi. Than plesae cascade your system with a system having magnitude responce equal to 1 but phase compansate in such a way that you got a phase difference equal to pi.
All Pass System do that Easily
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